After saying goodbye to Lei Yan, Chen Rui went to the stone mountain again. He suddenly had an idea, it was a bold idea, and he wasn't sure if it would succeed.

Recalling one of the simplest spells in the Soul Decision, Finger Inflammation, Chen Rui concentrated the transformed spiritual power in his body on his fingertips, and then raised his index finger straight and remained motionless.

From the side, Chen Rui stood there staring at his index finger like a fool, but not long after, half an inch above Chen Rui's index finger suddenly swung and a cluster of flames ignited out of thin air. With a "stab" sound, the flames rose sharply after increasing the spiritual power, reaching more than half a foot high. Moreover, the temperature of the flame is also extremely high, and the space around it is distorted for about three inches. Chen Rui looked at this cluster of flames, thinking in his heart, he was still not very satisfied, and immediately mobilized the internal strength in his body to condense it at his fingertips.

The flames on his fingertips seemed to feel something, and they immediately became agitated. Chen Rui also noticed it, but he clearly felt that the power contained in this cluster of flames was much stronger than just now.

Chen Rui gritted his teeth, and the internal energy in his body was continuously injected into his fingertips.

"Bang!"

The flames on Chen Rui's fingertips were furious, like a short-circuited lamp, flashing twice quickly and then exploding directly. The air wave generated by the explosion was like a wave that burst an embankment, instantly sweeping the surrounding area of twenty meters.

Chen Rui, who bore the brunt of the blow, was the first to be blown over by the air waves, and he quickly shrank into a ball until he hit a thick pine tree.

"Hahaha. Chen Rui leaned on the trunk of the tree and looked at his tattered clothes and laughed, he never thought that the intertwining of these two energies would make an ordinary spell so powerful, it was simply "adding fuel to the fire".

Chen Rui didn't have anything to do with himself, he used his internal strength to protect his safety in time when the explosion occurred, but the stone he was standing on just now was miserable. The stone was long gone, leaving only a deep crater, and the occasional sound of the stone falling as it shattered could be heard.

"Terrifying! If you can master this kind of power, will you still be afraid of Xiao Yu?" Chen Rui was overjoyed.

Gathering spiritual power again, another flame appeared on Chen Rui's fingers. This time, he changed his policy, first adjusting the output of small spiritual power and then injecting internal energy.

"Bang!"

The flames of the fingertips exploded again. Fortunately, the amount of spiritual power and internal energy injected is small, otherwise it will be blown up again.

Chen Rui didn't give up, and tried several times in a row, but all failed. It was impossible to continue, the spiritual power in his body was limited, and it was almost consumed by now.

Although there was a little bit of a loss, on the whole, Chen Rui was quite happy. If such an infinitely powerful power can be mastered overnight, it is too fake, and a bit of bumpy is expected. Chen Rui didn't know that he was playing with fire, and this different energy was very likely to make him go crazy, and as long as one was not careful, it would kill him. But Chen Rui is a novice cultivator, he does it wherever he wants, and he actually makes him successful.

The exhaustion of spiritual power made Chen Rui exhausted, and as soon as he returned to the room, he fell asleep as if he had no bones, and he didn't even change the clothes on his body.

When he woke up, it was about three o'clock in the afternoon, Chen Rui washed up and lay on the bed again.

"These two energies are powerful together, but I don't know how to control them. I guess the old man knows something, but it's a pity that he is not in the valley now, alas. Chen Rui stared at the ceiling and muttered to himself, there was nothing he could do if he thought about it, and it was really difficult to do it if the spiritual power in his body had not recovered much.

In desperation, Chen Rui went to find his senior brother Lei Yan to see if he had any elixir to quickly restore his spiritual power. Stopped a boy and told him to take him to his brother's house.

"Knock knock, senior brother, are you inside?" Chen Rui knocked on the door and asked.

"Come in, I'm here. Lei Yan's familiar voice came from inside.

It was a room of the same style as Chen Rui's own, but it was more than twice as large as Chen Rui's, because it was filled with all kinds of books. Looking at such a diligent senior brother, Chen Rui scratched his head embarrassedly.

"Is there anything to find me?" Lei Yan asked without looking back at Chen Rui as he flipped through a thick book.

"Hehe, I originally wanted to ask Master if there was any kind of elixir that could quickly restore spiritual power, but his old man was not in the valley, so he could only come to disturb you, Senior Brother. Chen Rui smiled apologetically.

"Is it to prepare for the Three Factions Ceremony?" Lei Yan turned his head and asked.

Chen Rui had long expected that his pretending to be Chen Cone would be seen by some people, so he didn't care, nodded and said, "Well, I want to make more preparations, so as not to suffer a loss when I get it." ”

"That's it, junior brother, the deeds of you and that Han Bu are spreading all over the place, at that time I thought who was so violent, and he could actually fight back and forth with the chief external disciple of the Ziyang Palace. I didn't expect it to be Senior Brother Chen, you are really hidden. Lei Yan directly broke it, revealing an expression that seemed to be surprised.

"Senior brother thought about it a lot, it's just that Han Bu let me. Chen Rui said modestly.

"Okay, junior brother, don't be too modest. I have the medicine to restore spiritual power here, and the name is the elixir. In the first drawer of the cabinet over there, you can go get it yourself. Lei Yan pointed to a black wooden cabinet against the wall.

"Thank you, senior brother!" Chen Rui took a bottle of elixir and bowed his head and bowed and exited Lei Yan's room.

With the assistance of the elixir, Chen Rui's spiritual power recovered extremely quickly, and it only took half an hour to recover almost.

In order to try a few more times, this time Chen Rui controlled the amount of spiritual power and internal strength to a minimum. But now the flames on his fingertips were powerless, although they could be controlled. Chen Rui was puzzled and didn't understand why this was happening. Tried over and over again, the flames on my fingertips were sometimes large and sometimes small, and it was elusive. Too much spiritual power will cause the flame to be too large, and too much internal energy will cause the flame to be difficult to control, and even the shape of the flame will be lost.

"Bang!"

The flames on his fingertips exploded again, and this time Chen Rui used the same energy as the first time, one layer of internal strength and nine layers of spiritual power. This explosion woke Chen Rui up, and he was shocked, "Could it be that the ratio of energy between the two is wrong? Just like preparing explosives, you must maintain a certain amount?"

He hurried to the room to find pen and paper, ready to write down the ratio of spiritual power and internal strength each time, so that the same operation would not be repeated.

After trying a few more times, Chen Rui was completely speechless, if the problem of insufficient spiritual power could be solved, at most he could eat a few elixirs, but his internal strength was gone, and he could only recover by resting.

After a mountain, there is still a mountain high, Chen Rui was made haggard by a series of problems in his cultivation, and he lost weight in just one week. In the past week, Chen Rui has completed the test of the situation where the spiritual power is higher than the internal strength is lower, but the results are not satisfactory, and all of them have failed. From today on, he will have to test it with internal strength as the main thing and spiritual power as the supplement.

"The internal strength is nine points nine, and the spiritual power is zero point one. Chen Rui wrote down the energy ratio on a piece of paper and began the experiment.

The flames on the fingertips swelled rapidly, and the ball that I thought would explode but was like a deflated ball, completely silent.

"Next. Chen Rui shook his head helplessly, and wrote on the paper again, "The internal strength is 9.8, and the spiritual power is 0.2." ”

In this way, Chen Rui tirelessly devoted himself to the experiment, and even if he failed, he would not waver, he was already numb. That's two days.

Day 3. "Internal strength is six, spiritual power is four. Noting down the proportions as usual, Chen Rui started a new experiment again.

"Boom!"

The flames on his fingertips erupted like a sharp sword, and bursts of powerful and terrifying energy fluctuations emanated from the flames, making people feel terrified! Chen Rui's heart was shocked, "Cheng, it's successful?!" He couldn't believe it, but the blue flames of the sky burning at his fingertips explained the facts.

"Fingertip Cangyan!" the word popped out of Chen Rui's mind for the first time. "Okay, then let's call this trick 'Fingertip Cangyan'!" Chen Rui's eight or nine days of hard work finally paid off, and he couldn't help but dance with his hands overjoyed